Overview
- The Met Office now says a multi‑day spell of very warm weather is likely and assigns about a 40% chance southern England could reach roughly 33°C during the Sunday–Monday bank holiday peak.
- Heatwave thresholds defined as three consecutive hot days are expected to be met from Sunday in southeastern England with conditions spreading into central and western England and parts of Wales.
- The UK Health Security Agency has issued yellow heat‑health alerts for several regions to warn of greater risk to vulnerable people and to urge precautions for hot indoor conditions and outdoor activity.
- U.S. forecasts show a sharp regional split for Memorial Day weekend with a cool, unsettled East and New England bringing showers and wet weather while the Texas Gulf Coast faces a Level 2 flash‑flood risk; the West Coast should remain mostly dry and South Florida stays hot with elevated rip‑current danger.
- Millions traveling for the holiday could see local travel and outdoor disruptions from heavy rain, flash flooding, heat exposure and beaches' rip currents, and forecasters note the heat follows last year’s extreme summer and a possible El Niño that can boost weather extremes.